stale-while-revalidate

stale-while-revalidate is an HTTP attribute on the Cache-Control header that defines an extra window of time during which a cache (proxy, user agents) can use a stale asset as long as it revalidates it asynchronously. This improves subsequent page load latencies as stale assets are non longer in the critical path.

Specification

Established standard

Status in Chromium

Blink components: Blink

Origin trial (tracking bug) in:

Chrome for desktop release 69
Chrome for Android release 69
Android WebView release 69

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

Firefox: No public signals
Edge: Mixed public signals
Safari: No public signals
Web Developers: Positive

Owners

kenjibaheux@chromium.org
dtapuska@chromium.org

Last updated on 2018-12-10